Divergence times

Friends! Can somebody guide us as to where can we find the known
divergence times between different organisms (especially prokaryotes).
All help such as addresses of web sites, books or journal articles (that
we may have missed) shall be useful.
We shall greatly appreciate all help rendered.
Bhupesh. 15-9-98.
Bhupesh Taneja,
Institute of microbial Technology,
Sector 39-A,
Chandigarh - 160036 (INDIA).
bhupesh at lion.imtech.ernet.inbhupesh at koel.imtech.ernet.in